In Russia (Federation), most of the time, the only change to be made is in the qualifier from R.S.F.S.R. to Russia, except when the name of the city has changed also (e.g. Leningrad to Saint Petersburg).
When using Russia (Federation) as a qualifier, the (Federation) drops out (RI 23.4B).
R.S.F.S.R. is always changed to Russia except when the name of the city changes (RI23.4B).
Moscow (R.S.F.S.R.) is never valid; always use Moscow (Russia).
Leningrad (R.S.F.S.R.) is valid for the period 1917-1991 because the name of the city changed. Saint Petersburg (Russia) is used today.